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<p>Implements a default allocation policy, without any optimality.  
 <a href="class_system_sharp_1_1_assembler_1_1_default_allocation_policy.html#details">More...</a></p>
<div class="dynheader">
Inheritance diagram for SystemSharp.Assembler.DefaultAllocationPolicy:</div>
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  <img src="class_system_sharp_1_1_assembler_1_1_default_allocation_policy.png" usemap="#SystemSharp.Assembler.DefaultAllocationPolicy_map" alt=""/>
  <map id="SystemSharp.Assembler.DefaultAllocationPolicy_map" name="SystemSharp.Assembler.DefaultAllocationPolicy_map">
<area href="interface_system_sharp_1_1_assembler_1_1_i_allocation_policy.html" title="Generic interface of allocation policy for hardware functional units " alt="SystemSharp.Assembler.IAllocationPolicy" shape="rect" coords="0,0,284,24"/>
</map>
 </div></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:ad0ce3fa9199824b02e289e1be5f60022"><td class="memItemLeft" align="right" valign="top"><a class="el" href="namespace_system_sharp_1_1_assembler.html#a21ca23e1edff90837bcb3eb567ec660d">EAllocationDecision</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_system_sharp_1_1_assembler_1_1_default_allocation_policy.html#ad0ce3fa9199824b02e289e1be5f60022">SelectBestMapping</a> (<a class="el" href="class_system_sharp_1_1_assembler_1_1_x_i_l3_instr.html">XIL3Instr</a> instr, long cstep, IEnumerable&lt; <a class="el" href="interface_system_sharp_1_1_components_1_1_f_u_1_1_i_x_i_l_mapping.html">IXILMapping</a> &gt; mappings, out <a class="el" href="interface_system_sharp_1_1_components_1_1_f_u_1_1_i_x_i_l_mapping.html">IXILMapping</a> bestMapping)</td></tr>
<tr class="memdesc:ad0ce3fa9199824b02e289e1be5f60022"><td class="mdescLeft">&#160;</td><td class="mdescRight">Selects the most suitable functional unit and the best mapping for a given instruction or opts to allocate a new functional unit.  <a href="#ad0ce3fa9199824b02e289e1be5f60022">More...</a><br/></td></tr>
<tr class="separator:ad0ce3fa9199824b02e289e1be5f60022"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a4d8c1c44ae528a0271dd4a763a3ac2d4"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_system_sharp_1_1_assembler_1_1_default_allocation_policy.html#a4d8c1c44ae528a0271dd4a763a3ac2d4">TellMapping</a> (<a class="el" href="class_system_sharp_1_1_assembler_1_1_x_i_l3_instr.html">XIL3Instr</a> instr, long cstep, <a class="el" href="interface_system_sharp_1_1_components_1_1_f_u_1_1_i_x_i_l_mapping.html">IXILMapping</a> mapping)</td></tr>
<tr class="memdesc:a4d8c1c44ae528a0271dd4a763a3ac2d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Informs the allocation policy about the actual mapping used by resource allocator.  <a href="#a4d8c1c44ae528a0271dd4a763a3ac2d4">More...</a><br/></td></tr>
<tr class="separator:a4d8c1c44ae528a0271dd4a763a3ac2d4"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-attribs"></a>
Static Public Attributes</h2></td></tr>
<tr class="memitem:a2acc3469ec3608335f59fc86c4273194"><td class="memItemLeft" align="right" valign="top">static readonly <br class="typebreak"/>
<a class="el" href="interface_system_sharp_1_1_assembler_1_1_i_allocation_policy_factory.html">IAllocationPolicyFactory</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_system_sharp_1_1_assembler_1_1_default_allocation_policy.html#a2acc3469ec3608335f59fc86c4273194">Factory</a> = new FactoryImpl()</td></tr>
<tr class="memdesc:a2acc3469ec3608335f59fc86c4273194"><td class="mdescLeft">&#160;</td><td class="mdescRight">Factory instance for creating a default allocation policy  <a href="#a2acc3469ec3608335f59fc86c4273194">More...</a><br/></td></tr>
<tr class="separator:a2acc3469ec3608335f59fc86c4273194"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Implements a default allocation policy, without any optimality. </p>

<p>Definition at line <a class="el" href="_x_i_l_mapping_8cs_source.html#l00177">177</a> of file <a class="el" href="_x_i_l_mapping_8cs_source.html">XILMapping.cs</a>.</p>
</div><h2 class="groupheader">Member Function Documentation</h2>
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          <td class="memname"><a class="el" href="namespace_system_sharp_1_1_assembler.html#a21ca23e1edff90837bcb3eb567ec660d">EAllocationDecision</a> SystemSharp.Assembler.DefaultAllocationPolicy.SelectBestMapping </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="class_system_sharp_1_1_assembler_1_1_x_i_l3_instr.html">XIL3Instr</a>&#160;</td>
          <td class="paramname"><em>instr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">long&#160;</td>
          <td class="paramname"><em>cstep</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">IEnumerable&lt; <a class="el" href="interface_system_sharp_1_1_components_1_1_f_u_1_1_i_x_i_l_mapping.html">IXILMapping</a> &gt;&#160;</td>
          <td class="paramname"><em>mappings</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">out <a class="el" href="interface_system_sharp_1_1_components_1_1_f_u_1_1_i_x_i_l_mapping.html">IXILMapping</a>&#160;</td>
          <td class="paramname"><em>bestMapping</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Selects the most suitable functional unit and the best mapping for a given instruction or opts to allocate a new functional unit. </p>
<p>The algorithm implementing the policy tries to solve an optimization problem: Since selected mapping implies interconnections between functional units, a good policy tries to minimize the quantities and sizes of datapath multiplexers or even tries to optimize the overall place-and-route result of the datapath being constructed. Moreover, there might be alternative mappings to the same functional unit. For example, addition is a commutative operation. Depending on how we connect operands to the ports of the adder, we might either re-use existing connections (good) or introduce new input multiplexers (bad). A limitation of this interface is that we are currently restricted a greedy heuristics: once a mapping decision is made, it cannot be altered in the future. Therefore, we cannot guarantee to find a globally optimal solution. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">instr</td><td>XIL-3 instruction to be mapped</td></tr>
    <tr><td class="paramname">cstep</td><td>c-step at which instruction is scheduled</td></tr>
    <tr><td class="paramname">mappings</td><td>sequence of possible mappings</td></tr>
    <tr><td class="paramname">bestMapping</td><td>the mapping from <em>mappings</em>  found to be most suitable by the policy</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>whether it is best to use one of the supplied mappings or to allocate a new functional unit</dd></dl>

<p>Implements <a class="el" href="interface_system_sharp_1_1_assembler_1_1_i_allocation_policy.html#a499c4fbd51ad9941d538f2e4642d7e91">SystemSharp.Assembler.IAllocationPolicy</a>.</p>

<p>Definition at line <a class="el" href="_x_i_l_mapping_8cs_source.html#l00193">193</a> of file <a class="el" href="_x_i_l_mapping_8cs_source.html">XILMapping.cs</a>.</p>

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<a class="anchor" id="a4d8c1c44ae528a0271dd4a763a3ac2d4"></a>
<div class="memitem">
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      <table class="memname">
        <tr>
          <td class="memname">void SystemSharp.Assembler.DefaultAllocationPolicy.TellMapping </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="class_system_sharp_1_1_assembler_1_1_x_i_l3_instr.html">XIL3Instr</a>&#160;</td>
          <td class="paramname"><em>instr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">long&#160;</td>
          <td class="paramname"><em>cstep</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="interface_system_sharp_1_1_components_1_1_f_u_1_1_i_x_i_l_mapping.html">IXILMapping</a>&#160;</td>
          <td class="paramname"><em>mapping</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Informs the allocation policy about the actual mapping used by resource allocator. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">instr</td><td>mapped XIL-3 instruction</td></tr>
    <tr><td class="paramname">cstep</td><td>c-step at which instruction is scheduled</td></tr>
    <tr><td class="paramname">mapping</td><td>selected mapping</td></tr>
  </table>
  </dd>
</dl>

<p>Implements <a class="el" href="interface_system_sharp_1_1_assembler_1_1_i_allocation_policy.html#a3e5dd7edf4f3f80474be05485a323221">SystemSharp.Assembler.IAllocationPolicy</a>.</p>

<p>Definition at line <a class="el" href="_x_i_l_mapping_8cs_source.html#l00199">199</a> of file <a class="el" href="_x_i_l_mapping_8cs_source.html">XILMapping.cs</a>.</p>

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<h2 class="groupheader">Member Data Documentation</h2>
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          <td class="memname">readonly <a class="el" href="interface_system_sharp_1_1_assembler_1_1_i_allocation_policy_factory.html">IAllocationPolicyFactory</a> SystemSharp.Assembler.DefaultAllocationPolicy.Factory = new FactoryImpl()</td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">static</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">

<p>Factory instance for creating a default allocation policy </p>

<p>Definition at line <a class="el" href="_x_i_l_mapping_8cs_source.html#l00191">191</a> of file <a class="el" href="_x_i_l_mapping_8cs_source.html">XILMapping.cs</a>.</p>

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<hr/>The documentation for this class was generated from the following file:<ul>
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